CN104438243B - A kind of method for cleaning of single-sleeve preheating device inner tube scab - Google Patents
A kind of method for cleaning of single-sleeve preheating device inner tube scab Download PDFInfo
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- CN104438243B CN104438243B CN201410634062.8A CN201410634062A CN104438243B CN 104438243 B CN104438243 B CN 104438243B CN 201410634062 A CN201410634062 A CN 201410634062A CN 104438243 B CN104438243 B CN 104438243B
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- inner tube
- preheating device
- sleeve
- sleeve preheating
- cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Cleaning In General (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The method for cleaning of a kind of single-sleeve preheating device inner tube scab that the invention discloses the present invention is, in single-sleeve preheating device inner tube used in cleaning aluminum oxide production process when scabbing, clear up according to the following steps, (1) operation is rinsed, the most first use giant by water under high pressure after the inner tube of the first order sleeve pipe of single-sleeve preheating device injects 30 minutes, then giant is injected 30 minutes from the inner tube of the afterbody sleeve pipe of single-sleeve preheating device；(2) abluent operation cleaning, is circulated obtained abluent flowing under about 60 DEG C temperature conditionss and cleans single-sleeve preheating device inner tube；(3) by compressed air, single-sleeve preheating device inner tube is carried out purging to clear up.The present invention not only has simple to operate, easy to use, cleaning and scabs clean advantage, but also have and single-sleeve preheating device inner tube will not produce corrosion or the advantage of infringement.
Description
Technical field
The present invention relates to the method for cleaning of a kind of single-sleeve preheating device inner tube scab, belong to the cleaning technique field of alumina producing single-sleeve preheating device inner tube.
Background technology
Single-sleeve preheating-autoclave heats one of dissolving-out technology advanced technology belonging to China's alumina producing industry indirectly, and device aluminium oxide production capacity used is big, but in production process,
Scabbing of producing in single-sleeve preheating device inner tube is inevitable.Owing in process of production, single-sleeve preheating device does not has stand-by equipment, clear up during being intended to be arranged in scheduled overhaul every time.The inner and outer pipe of single-sleeve preheating device all uses seamless steel pipe, and inner tube is slurry channel, and outer tube is steam channel, and often inner tube scab is more serious, particularly in high temperature section.At present, the cleaning of single-sleeve preheating device inner tube scab is main uses acid system cleaning, abluent acid concentration used by acid system of the prior art cleaning is too high, and pickling time is long, when the inner tube of single-sleeve preheating device and attachment weld thereof are had more serious corrosion phenomenon, particularly digestion series to restart increasing temperature and pressure to certain value by this, indivedual commissures of inner tube there will be oozes alkali, the even breach having, thus cause digestion series parking again to process.The manner of cleaning up of the most existing single-sleeve preheating device inner tube scab or not ideal enough, it is impossible to meet the needs used.
Summary of the invention
It is an object of the invention to, it is provided that a kind of simple to operate, easy to use, cleaning scabs the clean and method for cleaning of single-sleeve preheating device inner tube scab that inner tube will not produce corrosion or infringement, to overcome the deficiencies in the prior art.
The technical scheme is that and be achieved in that:
The method for cleaning of a kind of single-sleeve preheating device inner tube scab of the present invention is, in single-sleeve preheating device inner tube used in cleaning aluminum oxide production process when scabbing, clear up according to the following steps,
(1) operation is rinsed, giant is the most first used to be injected from the inner tube of the first order sleeve pipe of single-sleeve preheating device by water under high pressure, water under high pressure is made directly to be washed on the inner tubal wall of single-sleeve preheating device, to wash away the object that scabs on inner tubal wall, make the water under high pressure injecting inner tube flow out together with the inner tube of the object afterbody sleeve pipe from single-sleeve preheating device that comes off under being washed simultaneously；After the inner tube from first order sleeve pipe injects water under high pressure 30 minutes, again giant is injected 30 minutes from the inner tube of the afterbody sleeve pipe of single-sleeve preheating device, make the water under high pressure injecting inner tube flow out together with the inner tube of the object first order sleeve pipe from single-sleeve preheating device that comes off under being washed simultaneously；
(2) single-sleeve preheating device inner tube is carried out after rinsing operation the cleaning of agent operation again, when being carried out the cleaning of agent operation, first by diluting concentrated sulfuric acid that concentration is 98% to the dilute sulfuric acid that concentration is 9～10%, then abluent is prepared by after 1.5% addition corrosion inhibiter of concentrated sulphuric acid amount used to dilute sulfuric acid stirs, under about 60 DEG C temperature conditionss, this abluent is pumped in single-sleeve preheating device inner tube by acid-proof pump, and after making it circulate no less than 45 minutes in single-sleeve preheating device inner tube, again the abluent in single-sleeve preheating device inner tube is all released；
(3) after the abluent in single-sleeve preheating device inner tube is all released, first by compressed air, single-sleeve preheating device inner tube is purged 5～10 minutes, then tap water is entered in single-sleeve preheating device inner tube by high-pressure pump pump, single-sleeve preheating device inner tube is circulated flushing 10～20 minutes, purges single-sleeve preheating device inner tube 5～10 minutes by compressed air the most again；So can complete the cleaning to single-sleeve preheating device inner tube scab.
Above-mentioned corrosion inhibiter is organic inhibitor.
Owing to have employed technique scheme, the present invention effectively overcomes the unfavorable factor of existing acid washing method, by test and actually used proof, abluent of the present invention, at a higher temperature cleaning is scabbed highly beneficial, and after the cleaning, the single-sleeve preheating device inner tube of cleaned mistake will not be produced any impact.And the present invention is during actual job, after once digestion series parking blowing is complete, single-sleeve preheating device inner tube can be cleared up.The present invention is easy and simple to handle, the equipment after cleaning, checks through cutting hole, and its cleaning that scabs is the cleanest.After the single-sleeve preheating device using the present invention to clear up comes into operation, its single tube discharging opening slurry temperature is up to about 160 DEG C, and whole preheating section slurry temperature reaches 200～210 DEG C, fullys meet design requirement, and meets the needs carrying product well.Therefore, compared with prior art, the present invention not only has simple to operate, easy to use, cleaning and scabs clean advantage, but also have and single-sleeve preheating device inner tube will not produce corrosion or the advantage of infringement the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but not as any limitation of the invention.
Embodiments of the invention:
The method for cleaning of a kind of single-sleeve preheating device inner tube scab of the present invention can be directly used for that existing single-sleeve preheating-autoclave heats single-sleeve preheating device used in dissolving-out process indirectly and carries out cleaning enforcement, in single-sleeve preheating device inner tube used in cleaning aluminum oxide production process when scabbing, clear up according to the following steps
(1) operation is rinsed, giant is the most first used to be injected from the inner tube of the first order sleeve pipe of single-sleeve preheating device by water under high pressure, water under high pressure is made directly to be washed on the inner tubal wall of single-sleeve preheating device, to wash away the object that scabs on inner tubal wall, make the water under high pressure injecting inner tube flow out together with the inner tube of the object afterbody sleeve pipe from single-sleeve preheating device that comes off under being washed simultaneously；After the inner tube from first order sleeve pipe injects water under high pressure 30 minutes, again giant is injected 30 minutes from the inner tube of the afterbody sleeve pipe of single-sleeve preheating device, make the water under high pressure injecting inner tube flow out together with the inner tube of the object first order sleeve pipe from single-sleeve preheating device that comes off under being washed simultaneously；
(2) single-sleeve preheating device inner tube is carried out after rinsing operation the cleaning of agent operation again, when being carried out the cleaning of agent operation, first by diluting concentrated sulfuric acid that concentration is 98% to the dilute sulfuric acid that concentration is 9～10%, then abluent is prepared by after 1.5% addition corrosion inhibiter of concentrated sulphuric acid amount used to dilute sulfuric acid stirs, under about 60 DEG C temperature conditionss, this abluent is pumped in single-sleeve preheating device inner tube by acid-proof pump, and after making it circulate no less than 45 minutes in single-sleeve preheating device inner tube, again the abluent in single-sleeve preheating device inner tube is all released；Corrosion inhibiter used is organic inhibitor, and the main component of organic inhibitor used is di-o-tolyl-thiourea, and this corrosion inhibiter inhibition efficiency is high, low price, if this organic inhibitor can directly use the fourth finished product sold on market；
(3) after the abluent in single-sleeve preheating device inner tube is all released, first by compressed air, single-sleeve preheating device inner tube is purged 5～10 minutes, then tap water is entered in single-sleeve preheating device inner tube by high-pressure pump pump, single-sleeve preheating device inner tube is circulated flushing 10～20 minutes, purges single-sleeve preheating device inner tube 5～10 minutes by compressed air the most again；So can complete the cleaning work to single-sleeve preheating device inner tube scab.
Claims (2)
1. the method for cleaning of a single-sleeve preheating device inner tube scab, it is characterised in that: in single-sleeve preheating device inner tube used in cleaning aluminum oxide production process when scabbing, clear up according to the following steps,
(1) operation is rinsed, giant is the most first used to be injected from the inner tube of the first order sleeve pipe of single-sleeve preheating device by water under high pressure, water under high pressure is made directly to be washed on the inner tubal wall of single-sleeve preheating device, to wash away the object that scabs on inner tubal wall, make the water under high pressure injecting inner tube flow out together with the inner tube of the object afterbody sleeve pipe from single-sleeve preheating device that comes off under being washed simultaneously；After the inner tube from first order sleeve pipe injects water under high pressure 30 minutes, again giant is injected 30 minutes from the inner tube of the afterbody sleeve pipe of single-sleeve preheating device, make the water under high pressure injecting inner tube flow out together with the inner tube of the object first order sleeve pipe from single-sleeve preheating device that comes off under being washed simultaneously；
(2) single-sleeve preheating device inner tube is carried out after rinsing operation the cleaning of agent operation again, when being carried out the cleaning of agent operation, first by diluting concentrated sulfuric acid that concentration is 98% to the dilute sulfuric acid that concentration is 9～10%, then abluent is prepared by after 1.5% addition corrosion inhibiter of concentrated sulphuric acid amount used to dilute sulfuric acid stirs, under 60 DEG C of temperature conditionss, this abluent is pumped in single-sleeve preheating device inner tube by acid-proof pump, and after making it circulate no less than 45 minutes in single-sleeve preheating device inner tube, then the abluent in single-sleeve preheating device inner tube is all released；
(3) after the abluent in single-sleeve preheating device inner tube is all released, first by compressed air, single-sleeve preheating device inner tube is purged 5～10 minutes, then tap water is entered in single-sleeve preheating device inner tube by high-pressure pump pump, single-sleeve preheating device inner tube is circulated flushing 10～20 minutes, purges single-sleeve preheating device inner tube 5～10 minutes by compressed air the most again；So can complete the cleaning to single-sleeve preheating device inner tube scab.
The method for cleaning of single-sleeve preheating device inner tube scab the most according to claim 1, it is characterised in that: described corrosion inhibiter is organic inhibitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410634062.8A CN104438243B (en) | 2014-11-12 | 2014-11-12 | A kind of method for cleaning of single-sleeve preheating device inner tube scab |
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| CN201410634062.8A CN104438243B (en) | 2014-11-12 | 2014-11-12 | A kind of method for cleaning of single-sleeve preheating device inner tube scab |
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| CN104438243A CN104438243A (en) | 2015-03-25 |
| CN104438243B true CN104438243B (en) | 2016-08-31 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107321724A (en) * | 2017-05-26 | 2017-11-07 | 株洲冶炼集团股份有限公司 | A kind of manner of cleaning up of aiutage |
| CN107167031A (en) * | 2017-06-06 | 2017-09-15 | 江苏苏力机械股份有限公司 | The dissolving cleaning of sinter in natural gas coil pipe |
| CN114210663A (en) * | 2021-11-19 | 2022-03-22 | 中铝中州铝业有限公司 | Method for cleaning bauxite leaching sleeve |
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| EP0767010A1 (en) * | 1995-10-05 | 1997-04-09 | Ryobi Ltd. | System and method for cleaning liuid passage by negative pressure |
| CN1847460A (en) * | 2005-04-05 | 2006-10-18 | 贵阳铝镁设计研究院 | Scale eliminating method for casing pre-heater |
| CN202037143U (en) * | 2011-04-27 | 2011-11-16 | 贵阳铝镁设计研究院有限公司 | Chemical cleaning and heating device |
| CN102784774A (en) * | 2012-08-08 | 2012-11-21 | 安徽六国化工股份有限公司 | Method for cleaning monoammonium phosphate inlet pipeline |
| CN104056816A (en) * | 2013-03-19 | 2014-09-24 | 刘飞 | Pre-heater cleaning method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007255723A (en) * | 2006-03-20 | 2007-10-04 | Chiyuugai Technos Kk | Method and apparatus for removing scale |
| US20100000576A1 (en) * | 2008-07-03 | 2010-01-07 | Lurgi Psi, Inc. | Method of Cleaning Beer Preheaters In An Ethanol Plant |
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- 2014-11-12 CN CN201410634062.8A patent/CN104438243B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0767010A1 (en) * | 1995-10-05 | 1997-04-09 | Ryobi Ltd. | System and method for cleaning liuid passage by negative pressure |
| CN1847460A (en) * | 2005-04-05 | 2006-10-18 | 贵阳铝镁设计研究院 | Scale eliminating method for casing pre-heater |
| CN202037143U (en) * | 2011-04-27 | 2011-11-16 | 贵阳铝镁设计研究院有限公司 | Chemical cleaning and heating device |
| CN102784774A (en) * | 2012-08-08 | 2012-11-21 | 安徽六国化工股份有限公司 | Method for cleaning monoammonium phosphate inlet pipeline |
| CN104056816A (en) * | 2013-03-19 | 2014-09-24 | 刘飞 | Pre-heater cleaning method |
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Effective date of registration: 20201106 Address after: 538100, the Guangxi Zhuang Autonomous Region, Fangchenggang, Dongxing ASEAN Avenue (formerly Industrial Park) Patentee after: DONGXING HUAHONG OPTICAL TECHNOLOGY Co.,Ltd. Address before: 550025 science and Technology Department, north campus, Guizhou University, Huaxi, Guizhou, China Patentee before: Guizhou University |
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Effective date of registration: 20210628 Address after: 538000 Bus Industrial Park, Gangkou District, Fangchenggang City, Guangxi Zhuang Autonomous Region Patentee after: FANGCHENGGANG SHENGNONG PHOSPHATE Co.,Ltd. Address before: 538100 ASEAN Avenue (former industrial park), Dongxing City, Fangchenggang City, Guangxi Zhuang Autonomous Region Patentee before: DONGXING HUAHONG OPTICAL TECHNOLOGY Co.,Ltd. |